Re: Better op-amp buffer configuration?

On Sat, 25 Jun 2005 10:31:06 +0100, in sci.electronics.design
poppy.uk@xxxxxxxxxxxxxxxxxxxxxxxx (Adrian Tuddenham) wrote:

>billcalley <billcalley@xxxxxxxxx> wrote:
>
>> Hi All,
>>
>> I realize that using a single-supply op-amp as a buffer may be one
>> of the easiest circuit configurations in the world; just tie the
>> chip's output back to the inverting input, and insert the signal into
>> its non-inverting input. That's how the books show it anyway, but
>> are their any real-life op-amp issues that I have to look out for with
>> this basic circuit? Anything I can do to make this circuit operate
>> better under temperature, along with the unavoidable op-amp variations?
>> Perhaps to help with any stability or voltage offset issues? Or is
>> this circuit simply the way op-amp buffers are done, even in real life?
>
>Check whether the chosen op-amp needs external compensation to be
>unity-gain stable (the NE5534 does).
>
>Check whether a resistor may be needed in series with the output to
>prevent problems if you are driving a capacitive load such as a long
>screened cable.
Put the isolating R in series with the output of the opamp, and take
the feedback to the -i/p After the resistor. Generally works, and
compensates for attenuation that you would get when you drive a lowish
Z load


martin
.

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